Steve pulled his boxers down to watch as his member got bigger. His uncut member stretched longer and thicker, balls pulling as they also swelled.
"Awesome!" he said as he wrapped a hand around the thick member, just before the skin his 9 incher began to darken and a weird sensation flowed down the tip.
The mottled brown skin on his cock and balls kinda scared him, and the shape under his foreskin looked different as well. Slowly he pulled back the skin, freeing the head.
Steve groaned as he saw the deformed head, thicker but stubbier than before, just like a horses.
"Dammit, I asked to be like a horse!" he said as he held his new member in his hand and wondered what he should do next.